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pandas dataframe columns scaling with sklearn
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@RajeshThevar The outer brackets are pandas' typical selector brackets, telling pandas to select a column from the dataframe. The inner brackets indicate a list. You're passing a list to the pandas selector. If you just use single brackets - with one column name followed by ...
MySQL error: key specification without a key length
...d, and the trick is to choose a number N that’s long enough to give good selectivity, but short enough to save space. The prefix should be long enough to make the index nearly as useful as it would be if you’d indexed the whole column.
Before we go further let us define some important terms. In...
Base64 encoding in SQL Server 2005 T-SQL
...the same:
-- Encode the string "TestData" in Base64 to get "VGVzdERhdGE="
SELECT
CAST(N'' AS XML).value(
'xs:base64Binary(xs:hexBinary(sql:column("bin")))'
, 'VARCHAR(MAX)'
) Base64Encoding
FROM (
SELECT CAST('TestData' AS VARBINARY(MAX)) AS bin
) AS bin_sql_server_t...
Is there a JavaScript MVC (micro-)framework? [closed]
...n excellent solution. It's everything is a plugin approach enables you to select only the features you need. As of 2.0, it's based on jQuery.
On progressively enhancing your website, that's left up to the user as JMVC provides just a middle layer for development - it's up to you to make that de...
How can you strip non-ASCII characters from a string? (in C#)
...= ' ')
{
var min = '\u0000';
var max = '\u007F';
return source.Select(c => c < min ? nil : c > max ? nil : c).ToText();
}
public static string ToText(this IEnumerable<char> source)
{
var buffer = new StringBuilder();
foreach (var c in source)
buffer.Append...
How to comment out a block of Python code in Vim
...to allow me to indent certain lines of code (whether those lines have been selected in visual mode, or n lines above/below current cursor position).
...
Get path of executable
... the predefined OS macros detailed at predef.sourceforge.net/preos.html to select the method is straightforward.
– Clifford
Oct 7 '09 at 15:02
5
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Java equivalent to Explode and Implode(PHP) [closed]
.... so you can use
subString/split
for Explode & use String
concate
for Implode.
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How do I URL encode a string
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New APIs have been added since the answer was selected; You can now use NSURLUtilities. Since different parts of URLs allow different characters, use the applicable character set. The following example encodes for inclusion in the query string:
encodedString = [myString...
初窥InnoDB的Memcached插件 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...插件目录我们能看到innodb_engine.so和libmemcached.so：
mysql> SELECT @@plugin_dir;
+------------------------------+
| @@plugin_dir |
+------------------------------+
| /usr/local/mysql/lib/plugin/ |
+------------------------------+
此外还需要导入Memcached插...